import Cesium from 'cesium/Cesium';
require('cesium/Widgets/widgets.css');
var viewer = new Cesium.Viewer('cesiumContainer',{
    imageryProvider : new Cesium.ArcGisMapServerImageryProvider({
        url : '//services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer'
    }),
});